Advertisements
Advertisements
प्रश्न
A car takes 2 hours to reach a destination by travelling at the speed of 60 km/h. How long will it take when the car travels at the speed of 80 km/h?
Advertisements
उत्तर
Let the time taken by the car to reach the destination, while travelling with a speed of 80 km/hr, be x hours.
The following table is obtained:
| Speed (in km/hr) | 60 | 80 |
| Time taken (in hours) | 2 | x |
Hence, the speed of the car and the time taken by the car are inversely proportional to each other. Therefore,
∴ 80 × x = 60 × 2
⇒ `x = (60 × 2)/80`
⇒ `x = 3/2 = 1 1/2`
The time required by the car to reach the given destination is `1 1/2` hours.
APPEARS IN
संबंधित प्रश्न
1200 soldiers in a fort had enough food for 28 days. After 4 days, some soldiers were transferred to another fort and thus the food lasted now for 32 more days. How many soldiers left the fort?
A toy company requires 36 machines to produce car toys in 54 days. How many machines would be required to produce the same number of car toys in 81 days?
Six men can complete a work in 12 days. Two days later, 6 more men joined them. How many days will they take to complete the remaining work?
If x varies inversely as y, then
| x | – | 60 |
| y | 2 | 10 |
If on increasing a, b decreases in such a manner that ______ remains ______ and positive, then a and b are said to vary inversely with each other.
If two quantities p and q vary inversely with each other then ______ of their corresponding values remains constant.
Find the values of x and y if a and b are in inverse proportion:
- 12 x 8
- 30 5 y
If a and b vary inversely to other, then find the values of p, q, r ; x, y, z and l, m, n.
| a | 6 | 8 | q | 25 |
| b | 18 | p | 39 | r |
In a hostel of 50 girls, there are food provisions for 40 days. If 30 more girls join the hostel, how long will these provisions last?
The variable x is inversely proportional to y. If x increases by p%, then by what per cent will y decrease?
